In the evaluation of the programs, there is a need to define the qualities and roles of the peer supporter, design programs which integrate and complement formal health services, identify optimal mix of modalities of intervention, types and dose response of these interventions and evaluate acceptability and effectiveness of these programs in different cultures. Other evaluation indexes include effects of programs on behavioral changes, knowledge and attitudes, functionality, clinical care as well as their cost effectiveness, reach, implementation-consistency, adoption and maintenance of effects over time.